public class MobileTelephone   { 
     SIM card; 
     public void useSIM(SIM card) { 
        this.card=card; 
 
     } 
      public void showMess() { 
        System.out.println("使用的卡是:"+card.giveCorpName()+"提供的"); 
   
 
       System.out.println("手机号码是:"+card.giveNumber()); 
     } 
  } 
   

